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    • 1. 发明申请
    • FLASH STEP PREPARATORY TO DIELECTRIC ETCH
    • 闪电步骤准备到电介质蚀刻
    • WO2003023841A1
    • 2003-03-20
    • PCT/US2002/028385
    • 2002-09-05
    • APPLIED MATERIALS INC. (a corporation of Delaware)
    • WANG, ZhuxuLIU, JingbaoBJORKMAN, Claes, H.PU, Bryan
    • H01L21/311
    • H01L21/31116
    • A dielectric plasma etch method particularly useful for assuring that residue does not form in large open pad areas used for monitoring etching of narrow via and contact holes. The main dielectric etch of the via and contact holes uses a highly polymerizing chemistry, preferably of a low-F/C fluorocarbon such as C 4 F 6 in conjunction with O 2 and Ar. A short flash step precedes the main plasma etch using a plasma of a gas less polymerizing than the gas of the main etch, and the plasma is not extinguished between the flash and main steps. The flash step may be used to remove an anti-reflection coating (ARC) covering the 10 dielectric layer and use a lean fluorocarbon, such as CF 4 ' perhaps together with O 2 and Ar . In the absence of ARC, an argon flash may be used.
    • 介质等离子体蚀刻方法特别适用于确保在用于监测窄通孔和接触孔蚀刻的大开孔焊盘区域中不形成残留物。 通孔和接触孔的主要电介质蚀刻使用高度聚合的化学物质,优选低F / C碳氟化合物如C 4 F 6与O 2和Ar结合。 使用比主蚀刻的气体少的聚合气体的等离子体进行主等离子体蚀刻之前的短闪光步骤,并且在闪光和主要步骤之间的等离子体不会熄灭。 闪光步骤可以用于除去覆盖10介电层的抗反射涂层(ARC),并且可以与O 2和Ar一起使用诸如CF 4的贫碳氟化合物。 在没有ARC的情况下,可以使用氩气闪光。